Bug: Incorrect count of notes in a notebook

Bug report:
In the folder hierarchy expanded, I have a folder which shows (1), indicating that there is one note/task somewhere in that sub-hierarchy, yet I have checked each sub-notebook and find none.

I use the folder hierarchy with names based on dates, and often move tasks that were not completed yesterday, into today’s notebook. Many times that can be 50 or more tasks. This is the first time I have seen an incorrect count of notes in notebooks.

Joplin 1.0.220 (prod, win32)
Client ID: 348634c19a984fbc80460ee0b23c7d45
Sync Version: 1
Profile Version: 30
Keychain Supported: Yes
Revision: 83e0bac5 (master)